Electric-arc lamp.



No. 742,604. PATENTED 00127, 1903.

Y e. R, DA-VISON.

ELEGTRIG ARC LAMP.

APPLICATION FILED FEB. 16, 1903.

.NO MODEL.

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UNITED STATES Iatented October 27, 1903.

PATENT OFFICE.-

GEORGE R. DAVISON, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TOSTANLEYYELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHUSETTS, ACORPORATION OF NEW JERSEY.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 742,604, dated October2'7, 1903.

Application filed February 16,1903. Serial No. 143,469. (No model.)

To all whom, it 17004] concern:

Be it known that I, GEORGE E. DAVISON, a citizen of the United States,and a resident of Pittsfield, county of Berkshire, State ofMassachusettahave invented certain new and useful Improvements inElectric-Arc Lamps, of which the following is a specification.

The object of my invention is to provide a means which shall avoid thedefects of prior structure for electrically connecting in circuit themoving carbon of an arc-lamp. It has been common to use aloosely-hanging flexible connection which is likely to catch in and bejammed by'the moving parts. It has also been common in order to avoidthis difflculty to coil the flexible connections in a spiral. This hasthe defect that it acts as a spring and prevents the free movement ofthe carbon. It also necessitates the use of a very smallconnecting-wire. My invention does away with both these difficulties andpermits free movement of the carbon without danger of catching andjamming the connecting-wire.

Referring to the drawings, Figure 1 shows a structure embodying myinvention, and Fig. 2 shows a side view of the same.

A represents one of the series coils.

B is the holder for the movable carbon carried by a cross-piece C, whichslides between guides D D.

E is the flexible lead running from the series coil "A to carbon-holderB. Lead E is preferably insulated with asbestos or other heat-resistingmaterial. Attached to guide D is the wire F. Lead E passes between guideD and wire F, which thus acts as a guide for lead E. By this means leadE is held away from the moving parts,and yet permits the free movementof carbon-holder B. Lead E and carbon-holder B may both be insulatedfrom the cross-piece C, thus making the lamp safe to handle and reducingthe danger of short circuits.

I do not desire to limit myself to the par- "ticular construction andarrangement of parts here shown, since changes therein which do notdepart from .the spirit of my invention will be obvious to those skilledin the'art.

Having thus described the invention, what I claim, and desire to protectby these Letters Patent, is-- 1. In anelectric-arc lamp, a movablecarbon-holder, a vertical guide therefor, a guiderod parallel to saidvertical guide, and a loosely-hanging flexible connecting-lead for saidholder passing between said vertical guide and said guide-rod. 2. In anelectric-arc lamp, a movable carbon-holder, a guide for said holder, awire parallel to said guide, and a flexible connecting-lead for saidholder passing between the said guide and the said wire.

3. In an electric-arc lamp, a carbon-holder, a cross-piece carrying saidholder, guide-rods for said cross-piece, a vertical wire attached to oneof said guide-rods, and a flexible connecting-lead for the carbon-holderpassing be tween the vertical wire and a guide-rod.

Signed at 'Pittsfleld, Massachusetts, this 13th day of February, 1903.

GEORGE R. DAVISON.

Witnesses:

RICHARD EYEE, L. A. HAWKINS.

